Transmission system



Jan. 9,lv 1928;

LESPENSCHIED. THANSMISSON SYSTEM.

FILD SEPT.26 17919.

I-NVENOR. Ee/zscwd pplicetion file Eepte'mber To all' '102mm it 'may concer'n:

Be. it known that l. LoYn EsriiNsoi-iren, i'esiding' at Hollis, in the county of Queens and State of New York, have invented certain lniproveinentsin ransniission Systenis, of which the following' is a. specification. i

- This invention i'elates to ti'ai'isinission systeins, and more particulai'ly to lines arrzinged. for the iiiultiplex tr'finsniission of a plurality of currents.

lt. is desii'able to utilize a coinnion transniission line for the multiplex traiisniission of a plui'alit-y of currents so that the line inay he used for several purposes at once. This may he acconiplished by inpi'essing on the line a. plui'ality of cai'rier fi'equencies sufiiciently separated from each other topi'event interference and each frequency -beingz assigned for use as a separate channel of communication so that siziials. such, for instance, as telephonicvariations inay be transniitted hy iinpi'essing' thcin upon the carrier frequeiicies. Several Channels niay thus he superposed upon a common ti'iiiismission line and each channel perforins the functions of an ordinary teiephone ti'ansniission line. ln addition to supei'posing a plurality of carrier chaniiels on line for .telephone purposes it may be (lesirable to also superpose a carrier channel for purposes such as riugi'ing or sigiiulingj. lfurthei'inoi'e it inny also' hc. (lesirable to transrnit over such a line l). C. Morse or telejraphic- (',uri'ents I ;i common transmission line ari'angi'ecl for the iiiultiplei; transmission of cui'i'ents for different purposes may often include appai'atus which will readily trensinit certain of the currents ti'ansniitted therwiver but which Will attenuateand extinii'uish other of said currents. Such a condition, for purposes of illustration, might a-rise iii a two-Wire line, including repeatei' apparatus, as the repeaters included in such a line might readily allow the transmission of the alternating currents utilized for telephonic orsigiialing purposes but would not transinit the D. C. Morse or telegraph currents transmitted over such 'a line. Accordingly it is 'a general purpose of this invention to provide in a multiplex transmission system arrangernents whereby certain of the currents `ti'ansniitted over such e system may he 'traiisrnitted around apparatus in such' a system which Would tend to attenuate or extinguish such N SYSTG 26, 1919. Eei'al li'o. 326,525.

currents. Another purpose feature of the invention consists in proiT `ingz errenge- Inents which inny beassoc-iatcd with a tran -inission line zirrang'ed for the one-Way transinission of currents for different purposes such as telephonic or signaling cnrrents. such zirra-ngzeinents allowing the one-Way line to he utilized a two-Way transinission line for currents used for other purposes, such as for telegraphic purposes. A specific illusti'ation of the above conditions would arise in connection With one of the two-Wire, oneway lines of the Well known four-Wire transinission system which line nii flit be arrange-d for one-way ti'ansinission o telephone and. signeling curren'rs and two-way transmissioi'i of telegraph cui'rents Other and further features and purposes of the inventiou will appear more fully from the detziiled description hereinafter given.

The invention may beinore fully understood froin the following' description, taken in connection with the zicconipanyin); drawiiig', 'iii ivhich is illustrated a circuit diagram einhodying a preferred form of the inifention. I

In thfe'di'awing is illustrated :i transmission line including' two'sections,l L1 and L2 iiitei'connected by la translating device 6. For purposes of illustration, the transla-ting device 6' hasI been shown as a one-Way vacuuni bull) repeater. and the trensniission line iiiziy he a/tn'o-wire one-Way portion of the Well known four-Wire type of transmission system, in which the 'line is arranged for the transmisiion of currents in one (lirection only. Hoivever, it is understood that the arrangenients of the invention niay equally well h/.e associatedwith e transiiiission line arranged for the two-way trensinission of curi'ents. While the repeater has been illusti'ated as of the vacuinn hulh type, and is arranged to tre-nsiiiit currents coming in over the line L1 out over the line L2, it is understood that othef' types of repeeters such as the mechanical repeater or other types of transla-ting devices might equallywell he einployed. The lines L1 and li: terininate in the networks N1 and N respectively adapted to balance to the said lines. ncluded in line L1 are the filters F1 and FT and included in line L2 are the lilters' F;g end F4. These filtei's may' he of the type illiistrated in the-United' States patent to G. A. lampbell, Nos,` 12279113 'guish Vside of such range. ssociated with line and 13221114. andere adopted to readily transmit a band ot' ilrequencies suitable tor purposes of teleplioning or signaling, hut which serve ,to attenuate und cxtin currents having i'rcquencies out-- L1 is a telegraph circuit including the windings of u polr relay 15 end the composite sets 14 and 16. Associated With the line L2 is a telegrsph circuit including' the windings of e polsrized rela-y 24 and the composite sets :25 end 26. The composite 14, 16, 25 und 26 are adepted to readily allow the transmission of currents suitable for telegraphic purposes, but which attenu- :ite and prectically extinguish currents of other treopiencies. The polarized relay 15 is controlled by telegraphlc currents coming inloiver line L1, end controls the vibratingcircu'it 19. The vibrating circuit 19 is of :i

``Well known type end serves to give n. rein- J forcing action to the energy coming in over line L1, whereby the telegraphie current's coming in over line L1 may be transmitted in refenforced form. from the Circuit 19 over the Circuit 21, 22. included in this hist mentioned Circuit is :i composite set 23 zidfzi'pted to readily transmit current suitable i'or telegraphic purposes, but which attenuntes end extinguishes currents of other frequencies. The circuit 21, 22 is bridged across the midpoints of the windings of the polerized relay 24. The polarized relay 24 is Controlled by telegraphic currents coming in over the line L2, and in turn controls the vibrating circuit 31. The vibrating circuit 31 is similar to circuit 19, end serves to give e re-enforcing action to the inc'omingzV energy Wherehy the telegraphic currents from line L1 may be tra-nsmitted in re enforced :form from circuit 31 out over the circuit 32, 33. T his last mentioned Circuit includes the composite set which is adapted to allow p the transmission of current suitable for telegraphic purposes, but which attenuates, und pructically extinguishes currents of other t'requencies rlChe circuit 32, 33 is bridg'ed across the midpoints of the' Windingzs of the polarized relziy 1'5.

The operzition of the invention is as followsz lternuting currents suitable for purposes otfitelephoning or signaling coming in over the line L1 will he transn'iittcd over the following circuit: from the line li. through the ilter F1, over conductors 1 and 2, through transi'ormer and over the input circuit Li, S of the repeatcr 6. These currents Will then be trnnsmittcd in nmplified form over the output circuit 7. 8, of the repcatcry through trens'torn'ier over 'oi1du.'tors end ll throuzii the filter F, and out over the line L. These telephonic or signziling currents coming in over line I "-.vill normelly have no effect on the telegrztphic Circuit essoeietedrwith line L1, as they will not he itransmitted. to the windings of polarized rel'zrv 15, due to the 'l'ict that tnev will bc tenuated end exting'hished by' the composite set li. llowever, it eny of these telcphonic or sigjnaliinq` n'-rcnts were of such ;i character that they mightbe trunsmitted through the filter L4: to the Windin of rclziy such currents Would be opposcd and neutralized in the Windings of rclay 15 by edu-ul and opposite signeling or telephonic currcnts which Would be transmittcd over conductors l? and 18 end through the composite set lj. ccordingly the telcpllonic or signalingr currents coming in over line lin will not uii'ect the tele- ;fruphic apparatus associz'zted With said line. yhe telephonic or signaling currcnts trans I/'itted from conductors lll and ll to the line L: Will noc'n'inlly' cause no disturbsnce in the telegrzxphie zil'ipuratus associated with 8 said line due to the tact that such currcnts will he attenuuted and extinguished by the composite sets 25 und 26. l'loweven it :inv of such telephonic or siiflmlingr currents were of such :i Character that they Would hc transniitted vtrom conductorsy 27 and 28 end through the composite set 2G to thel Windings of the polarized reluy 2%, such cnrrents would be opposed and ncutralized in saidb n'inding's ll] an equal und opposito current trensniitted over conductors 29 and 80. :ind through the con'i} ositc set 25. ;'M'cordingly the telephonic or signuling;` currenrs applied to line llgf Will cause no inter'lierem'e with the telegrziphic apparzitus associetcml. With 'aid line.

'llelegraphic currents may he tronsniitted from the line L] to the liuc L2 in the tollowing mnnner: Telcgrnphic currents zip-1 plied to the line L, will be transniittefl over .conductors 12 and 13 throi'igzh the composite set 14: und to the windiugzs otl the polerized relay 15, thcreby actuating the reilziy 15. The polarity of these incoinin;{` telegruphic curreuts will determine the operation of the polar relay The operation of the rclay 15 in turn Will control the circuit ll) wherelJy current of either polarity inny be applied from the battery l, or the battery B2 to the. outgoing circuit BL 22. rlfhis last nientioned current being' :applied to the mil points of the windings or polarizcd relay fi will not ailiect the relav 24, and these currents will be applied through composite sct 26 and over comluctors 2? and 528 and out over the line L2. lt is pointed out that these telegraphic currents ,coming in over line L` Will not atl'ect the repeater (i, as they will he attenuated. end przictically cxtin guisled by the filters F1 end F2. `i1rtliei'- more, the telegraphic currents applied from conductors and 28 to the line L2 will not interfere with 'the rcpeeter c pai'stus, they wili he attenueted und o 'cully ei: tinguished by the ilters F3 Telegraphie currents may be transmitted from the hne L2 to the line L1 in the foliownig manner: Telegraphlc currents will be transinitted from line L2 over conductors` 27 end through the composite set 26 and thence through the windings of the polari'zied relay 24. The polarity of these in coming currents will determine the opera-` tion of reley 24 which in turn will control operation of the vibrating Circuit `31, whereby current from the batteries B3 and B1 of either polarity may be transinitted over the output Circuit 32, 33. As the output circnit 32, 33 is bridge-,d across the midpoints of the windings of polarized relay these telegraphic cnrrents will cause no dislurbance or operation of relay 15. These telegraphic currents Will th'en be transmitted through the composite set 141 end over ('.onductors 12 and 18 and out over the line L1. These last ment-ioned telegraphic euri'ents applied from conductors 12 and 13 to the line L1 Will'not interfere with the repeater 6, as they will be attenuated and practically extinguished by the filter F1. fiowever, if these tclegraphic currents were not effectually'attenuatecl and extinguished by filter F1, and a portion of said currents Were transmitted through the filter F1, these last mentioned currents would be opposed `and nentralized et points 36 and 37 by eqnal end 'opposite currents transmitted from co'nduetors 32 and 33 over conductors 17 and 18 and through the filter F1. Accordngly the tclegraphic currents transmitted from 'line 2 to line L1 Will cause nointerferencewith telephonic or signelingr apparatus of the 'stenr ri`he composite devices 23van`d 34 'included in the telegraph circuits are provided to shut out any surges of the Morse cnrrents for vibrating circuits 19 and 31, vrqhich might be 'within the signaling or telerange.

' Thile the invention has been discloseidin specific arrangeinents which hve i icemcd desirable it is understood that erei provide a means Whereby two-Way transmission of certain types of currents niej-f be obtained over a transmission line which is arranged for only one-way transmission of other types ofcurrents. Accordingly the iirrangenients of the inventions are. capable of elnbodiineut in niun)v and \\^idel Varied forms without depnrting from the spirit of the invention as delined in thc'appended claims.

'lhat is clailned is.:

1. A transniission line upon which are snperiniposed nlternatingir signnling cnrrents and direct tclcgraph cnrrents. `said linc comprising two line. sections intcrconnccted by :i signaling Circuit bridg'cd across each of said line Sections and inclndin1r a translatingV device. arrnnged to transmit only said alternating signnlin;r cnrrcnts` a telegraph Circuit intercmuiccting' said line sections said telegraph circuit coinprising a balnnced four-Wire circuit including rclays each `provided with two .linc windings` windings of said relnys being' bridg'cd across each of said line Sections on each side of said bridg'cd signaling circnit conncction.- and means for preventiug said s'i;'iiillii11 v currents from being transinitted over said telegraph circnit.

2. A transinission line upon which :irc snperiniposcd altcrnatingr signalini` currents 'and direct telcgzraph cnrrents snid linel comprising two line scctions intcrconnected by a sigznalingv circnit bridzed across each of said line Sections and including' a translating device arriinged to transnlit only said alternating signaling currents, ilters in said line sectionsfor prcvcnting telegraph currents from being transmitted over said bi'idged signaling circuit. a telegrnph circuit interconnecting` said line sections` said telegraph Circuit comprising a balanced fourwire' Circuit having two two-Wire circnits and relays each provided with two line windings, telegraph repeaters in each of said two-Wire circuits, wind'ings of said relays being bridged across each of said line Sections on each side of said bridged signailing circuitfi/connect-ion and meansfor preventing saitl signaling' currents from being transmitted over said telegrhph Vcircuit,

In testimony Whereof, have signed niy name to this specification this th day of September, 1919.

LLU YD ESPENSCHED, 

